West Yellowstone Weather in September
Average highs run from 74°F on September 1 to 60°F on September 30, and lows from 32°F to 27°F. Normal precipitation for the month is 1.69 in.
September day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
September at a glance
- Average high
- 68°F
- Average low
- 30°F
- Precipitation
- 1.69 in
- Record high
- 90°FSep 4, 2022
- Record low
- 13°FSep 12, 2014
- Chance of a freeze
- 100%
- Daylight
- 13 h 14 min to 11 h 46 min
- Cloud cover
- 50%
- Humidity
- 54%
- Dew point
- 31°F
- Wind
- 4.7 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Sep 1 | 74°F | 32°F | 87°F 2007 | 23°F 2018 | 0% | |
| Sep 2 | 73°F | 32°F | 88°F 2022 | 26°F 2008 | 0% | |
| Sep 3 | 73°F | 32°F | 87°F 2007 | 25°F 2010 | 0% | |
| Sep 4 | 73°F | 32°F | 90°F 2022 | 25°F 2010 | 0% | |
| Sep 5 | 72°F | 31°F | 87°F 2022 | 23°F 2008 | 0% | |
| Sep 6 | 72°F | 31°F | 88°F 2020 | 23°F 2010 | 0% | |
| Sep 7 | 72°F | 31°F | 89°F 2022 | 19°F 2010 | 0% | |
| Sep 8 | 71°F | 31°F | 90°F 2022 | 19°F 2010 | ||
| Sep 9 | 71°F | 31°F | 85°F 2024 | 18°F 2020 | ||
| Sep 10 | 70°F | 31°F | 86°F 2021 | 18°F 2020 | ||
| Sep 11 | 70°F | 30°F | 80°F 2021 | 22°F 2022 | ||
| Sep 12 | 70°F | 30°F | 82°F 2017 | 13°F 2014 | ||
| Sep 13 | 69°F | 30°F | 82°F 2017 | 19°F 2012 | ||
| Sep 14 | 69°F | 30°F | 77°F 2020 | 22°F 2014 | ||
| Sep 15 | 68°F | 30°F | 81°F 2020 | 23°F 2026 | ||
| Sep 16 | 68°F | 30°F | 81°F 2020 | 22°F 2026 | ||
| Sep 17 | 67°F | 29°F | 80°F 2009 | 22°F 2021 | ||
| Sep 18 | 67°F | 29°F | 80°F 2009 | 20°F 2021 | ||
| Sep 19 | 66°F | 29°F | 76°F 2010 | 25°F 2018 | ||
| Sep 20 | 66°F | 29°F | 79°F 2010 | 23°F 2013 | ||
| Sep 21 | 65°F | 29°F | 82°F 2009 | 22°F 2011 | ||
| Sep 22 | 65°F | 29°F | 77°F 2012 | 21°F 2009 | ||
| Sep 23 | 64°F | 28°F | 76°F 2012 | 22°F 2018 | ||
| Sep 24 | 64°F | 28°F | 79°F 2009 | 23°F 2025 | ||
| Sep 25 | 63°F | 28°F | 80°F 2009 | 19°F 2018 | ||
| Sep 26 | 63°F | 28°F | 82°F 2015 | 17°F 2018 | ||
| Sep 27 | 62°F | 28°F | 78°F 2010 | 18°F 2018 | ||
| Sep 28 | 61°F | 27°F | 80°F 2010 | 19°F 2009 | ||
| Sep 29 | 61°F | 27°F | 80°F 2010 | 17°F 2020 | ||
| Sep 30 | 60°F | 27°F | 78°F 2024 | 15°F 2021 |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MDT).
- September 1
- sunrise 6:47 AM, sunset 8:01 PM
- September 30
- sunrise 7:21 AM, sunset 7:07 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00248858 (W Yellowstone Gateway), public domain. Records: NOAA GHCN-Daily, station USC00248858, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.